Question

Can Farfetch'd learn any attacks with increased critical hit ratio?

Answer 1

Slash, Night Slash, Air Cutter, and Leaf Blade.

http://pokemondb.net/pokedex/farfetchd

Hope this helps!

Comments

That means that if Farfetch'd is holding Stick and uses one of these moves it always is a critical hit!

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Not always
And don't even use Farfetch'd it sucks

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besides, relying on crits is pretty risky, as it falls apart the instant you come across something that is immune to them (with the ability Shell Armour or Battle Armour), and it is still chance as to whether you get a crit, it is just a higher chance than normal.